Oil-well derrick



Patented lan. 24, I899.

No. 6l8,297.

Nrrn STATES PATENT mes.

FRANCIS R. SHAW, OF cI-IA'rnAM onivrnn, omo.

OIL-WELL DERRICK.

SPECIFICATION forming part of Letters Patent no. 618,297, dated. January 2'4, 189:).

Application filed February 24,1898. Serial No. 671,4 l6i (no model.)

To ctZZ whom it may concern:

Be it known that I, FRANCIS R. SHAW, a citizen of the United States, residing at Ohatham Centre, in the county of Medina and State of Ohio, have invented certain new and useful Improvements in Oil-\Vell Derricks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in derricks for oil-wells, and has particular reference to the bull-wheel-actuating mechanism 3 and it consists, essentially, of a curvedtooth pinion or casting and a series of levers and ratchets for operating and controlling the movement of the bull-wheel shaft.

The invention further consists in the novel construction and combination of the several parts of the device hereinafter described, illustrated in the drawings, and more particularly pointed out in the claim hereunto appended.

In the drawings, Figure l is a perspective view of an oil-derrick with the framing partly removed to show my invention applied thereto. Fig. 2 is a view of the actuating mechanism in detail, showing the bull-wheel shaft in section. Fig. 3 shows details of construction. Fig. t is a detail.

Similar letters of reference indicate corresponding parts in the several figures.

Referring to the drawings by letters, A indicates the platform of the derrick, upon which the working parts of the device are mounted, and B is a derrick-frame mounted thereon.

H is a pulley in the top thereof over which passes the weight-lifting rope, and b is a guidepiece located in said framing above the working parts of the derrick and is provided with a number of openings 79 to receive and guide the rope to different parts of the bull-wheel shaft. The guide-piece b is so placed that one of the openings 1) theerin is immediately over one of the drums on the shaft D.

C C are upright supports into which are journaled the ends of the bull-wheel shaft D. Upon this shaft D are a cone-pulley and a series of drums E E E E of different diameters, either rigidly secured thereon or integral therewith, upon which the rope X, carrying the weight, is wound. On the opposite end of this shaft D is rigidly secured a brakewheel F, which is controlled bya band-brake F, secured to the platform A in any suitable manner, the said brake being operated by the lever F suitably pivoted for that purpose.

Upon the shaft D is rigidly secured a pinion or wheel G, having its teeth curved, as shown, or set at an angle to a radial line drawn through said casting.

H is a rock post or lever journaled in suitable brackets h h on the platform A, the said post or lever being adapted to rock at right angles to the shaft D. At the upper end of this rock-lever H is pivoted a rack or bracket I, having placed at equal intervals therein rungs 2', adapted to engage with the curved teeth on the pinion or wheel G, for a purpose hereinafter stated. The free end of the ladder I is attached to a lever K by rope is or other suitable means for the purpose of lifting said rack out of engagement with the wheel G when desired.

L is a shackle-rod supported by a post or standard M and pivoted at one end to the rock-lever H and is for the purpose of rocking said lever H to and fro to impart motion to the ladder I and pinion or wheel G and shaft D. The rock-lever II is provided with a number of holes or openings h near its upper end to varythe leverage imparted bysaid shackle-rod.

N-is a lever pivoted in suitable brackets 91 n on the platform A, and has secured thereto at its pivoted end the ratchet-tooth .L which tooth is adapted to engage and hold the said casting G against a backward movement during the operation of lifting the weight. This tooth N is normally held in engagement with the said casting by the weight of the lever N, but is disengaged and held away from said casting by raising the end of the lever N by the pivoted lever O.

The operation of the device is as follows:

The rope X, which is suitably arranged in the IOO ered into engagement with the wheel G, the shackle-rod is pushed forward and by reason of the curvature of the teeth will slide over them without imparting motion thereto, and

when the rack has gone to its full extent'the 'that by this arrangement the use of horses or steam-engines, which have heretofore been used for this purpose, is unnecessary and can be entirely done away with.

Having thus described my invention, what I claim is In a lifting device of the character described, a shaft D journaled in suitable bearings having rigid thereon a cone-pulley, a brake-Wheel F, a brake-band F adapted to engage therewith, a lever for operating said brake-band;

a tooth-wheel having forwardly-curved teeth,

a pawl N rigidly secured to the lever N, pivoted to a suitable base and adapted to engage the teeth of said wheel to hold the said drum in look position, and a lever 0 adapted to engage the lever N to hold the said pawl outof engagement with the said wheel, in combination with a suitablederrick havinga rope supporting and carrying means therein, a rope adapted to be secured to and wound upon said pulley, and a guide-piece in said derrick adapted to guide and hold the said rope on the proper step of said pulley, as and for the purpose set forth. I

In testimony whereof I affixmy signature in presence of two witnesses. r

FRANCIS R. SHAWV. Witnesses:

' S. L. DYER, S. J. DYER. 

